If it works for you, I’d disregard the notice. I’d only return for a free redesigned thermos.
If they redesigned the cap with a pop valve to release the pressure before opening, that would probably fix the problem.
They said it’s a danger to people who “leave food in too long”.
So people who forget about their food and let it ferment is what I am thinking.
Thats not me. I like my lunch on the rig.